Obstructive Sleep Apnea, Glucose Tolerance, and β-Cell Function in Adults With Prediabetes or Untreated Type 2...

Area of Science:

• Endocrinology
• Sleep Medicine
• Metabolic Disorders

Background:

• Obstructive sleep apnea (OSA) is linked to insulin resistance and type 2 diabetes.
• The effect of OSA on pancreatic islet beta-cell function is not well understood.
• Prediabetes and type 2 diabetes share common risk factors with OSA.

Purpose of the Study:

• To investigate the association between OSA, short sleep duration, and beta-cell function.
• To assess these associations in overweight/obese adults with prediabetes or newly diagnosed type 2 diabetes.
• To clarify the role of OSA in the pathophysiology of glucose dysregulation.

Main Methods:

• 221 overweight/obese adults with prediabetes or treatment-naive type 2 diabetes participated.
• Wrist actigraphy and polysomnography assessed sleep duration and OSA severity (apnea-hypopnea index, AHI).
• Oral glucose tolerance tests and hyperglycemic clamps measured glucose metabolism and beta-cell responses.

Main Results:

• OSA was highly prevalent (89%), with varying severity levels.
• Higher AHI was significantly associated with increased HbA1c levels (P=0.007).
• Neither OSA severity nor sleep duration correlated with fasting glucose, 2-h glucose, insulin sensitivity, or beta-cell function.

Conclusions:

• OSA is common in adults with prediabetes or newly diagnosed type 2 diabetes.
• While OSA severity relates to HbA1c, it does not appear to directly impair insulin sensitivity or beta-cell function in this population.
• Further research is needed to fully elucidate the complex relationship between sleep disturbances and metabolic health.